Change the overlaying order of lines in ggplot

Question

Suppose I have this plot:

library(ggplot2)
pl_data <- data.frame(x = rep(c(1, 2), times = 3), y = c(0, 1, 1, 0, .7, .7), col = rep(c(\"r\", \"b\", \"g\"),         


        

Answer 1

library(ggplot2)
df <- data.frame(
  x = rep(c(1, 2), times = 3), 
  y = c(0, 1, 1, 0, .7, .7), 
  col = rep(c("r", "b", "g"), each = 2))

ggplot() + 
  geom_line(data = df[3:4,], aes(x = x, y = y), color = 'blue', size = 3) +
  geom_line(data = df[5:6,], aes(x = x, y = y), color = 'green', size = 3) +
  geom_line(data = df[1:2,], aes(x = x, y = y), color = 'red', size = 3)